Deep glassy state dynamic data challenge glass models: Elastic models

There is increasing experimental evidence that suggests the dynamics of glass forming liquids do not diverge at finite temperature above zero Kelvin, same time there has been recent progress in development non-diverging transition models. In this work we examine two models: elastically collective nonlinear Langevin equation theory (ECNLE) and shoving model, both which relate an energy barrier formation process with elastic motion small scales. The models are evaluated comparison dynamic data obtained deep glassy state (very stable) for a 20-million-year-old (20 Ma) ancient amber vapor deposited amorphous Teflon previously. We find although qualitative agreement stable glasses, they still overestimate actual relaxation times below nominal conditions corresponding to equilibrium or upper bounds values.